Usage History of 'rarifying'

The following chart shows how frequently 'rarifying' appeared in printed materials over time. For example, the word 'rarifying' occurred 4 times in books in 1667 and 74 times in 2008. From 1667 to 2008, the word 'rarifying' was used a total of 3,507 times in books scanned by Google. See Reference: Google Ngram project.

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